This module's function has meaning only when the computer is on a local network. It pings the local DNS server twice each hour to check whether it supports service discovery and it sends/receives packets to a specific IP address, (224.0.0.251). By industry convention routers never forward outside the LAN any packet to any IP address beginning with "224.0.0". This is the module's role in Bonjour technology that allows users to add services such as network printers or network cameras to a local network without having to configure anything manually. Bonjour is built into the Apple Mac OS X operating system; this module is part of the Windows implementation and is installed by a large number of applications such as Apple iTunes, Adobe's Creative Suite applications, (Photoshop, Acrobat, InDesign, etc.), Gizmo, and others.Different applications have different reasons for incorporating Bonjour technology. Many network printers and network cameras use web pages for their status and configuration and Bonjour allows them to "advertise" this website name and the local computer to perceive it. Adobe's Creative Suite uses Bonjour to implement Version Cue, a client/server-style file sharing and collaboration system which requires that a Version Cue server be installed on the local network; Bonjour allows such a server to be configured automatically into the network and thereafter, on the local computer, finds whether such a server is present so the user can log into it to share files. Users of Apple iTunes on Windows systems benefit from its use of Bonjour to find shared music libraries or AppleTV's or AirPort Express devices to stream music to.
If you want a detailed security rating about your mDNSResponder.exe (and all other running background processes) read the following user opinions, and download the free trial version of Security Task Manager.

Note: Any malware can be named anything - so you should check where the files of the running processes are located on your disk.
If a "non-Microsoft" .exe file is located in the C:\Windows or C:\Windows\System32 folder, then there is a high risk for a virus, spyware, trojan or worm infection!
Check it out!

Users Opinions

Average user rating of mDNSResponder.exe:
based on 217 votes. Read also the 235 reviews.

9775 users ask for this file.
50 users rated it as not dangerous.
20 users rated it as not so dangerous.
78 users rated it as neutral.
35 users rated it as little bit dangerous.
34 users rated it as dangerous.
43 users didn't rate it ("don't know").

All comments about mDNSResponder.exe:

Used by the Apple Redezvous networking system. Responds to network requests for resources if setup. See also: LinkNidonocu

Unknown application. I do not have any Apple products (incl Quicktime) on this computer. Sean A. Turvey U.E.

Was not previously installed on my computer until an update to the VOIP app Gizmo was automatically installed, at which point it started requesting access every time the internet connection started. Also concurrent with DNS problems although they may be unrelated. EK

It was installed on my computer by Apple iTunes v5.0 without my permission. It can be stopped in "Services" and then deleted. MsConfig will allow you to turn it off, listed under services tab. Jim Boka

This file is associated with Quick Time Movie Player. The details of what it does exactly is unknown, but if you trust Apple, your good to go. Damien

belongs to apple rendezvous if not installed by yourself your camera, printer, scanner or other peripherals might have come with it ...

Also seems that Predixis Magic MusicMixer Anton

May be installed by Gizmo. Some people seem concerned about it, but on balance I think it's probably harmless. Note that it may hamper the installation of some versions of iTunes which may try to install another version. See also: LinkSteve (Australia)

It will clog up domains with NBNS requests. Get rid of it! Looks like Apple has jumped on the malware wagon. Billy Johnson

mdnsresponder.exe is a process associated with "Bonjour for Windows" software. It is used by ITunes for music sharing Iron

I have it in Music Magic Mixer directory DenisI

making my windows goin strange, When I press ESC it has an effect like I press windows button, and it will disabled the CTRL+C and CTRL+V button, but when I turn it off everything back to normal Bad'Z

May be installed by Gizmo. Some people seem concerned about it, but on balance I think it's probably harmless. Note that it may hamper the installation of some versions of iTunes which may try to install another version. See also: LinkSteve (Australia)

Possible it's part of Skype. I don't use iTunes, McAfee, any Apple software. Winamp, David

mdnsresponder.exe is a process associated with "Bonjour for Windows" software. It is used by ITunes for music sharing. This is a non-essential process. Disabling or enabling this is down to user preference. See also: LinkDaniel Borges

It was installed on my PC as part of Extensis Portfolio 8. I have Zone Alarm installed so it has to ask permission to connect to the internet and until I know what it does I won't let it. Portfolio works fine without it connecting to the internet. I suspect it is gathering information on how I use the software but I'm not sure. Sally (UK)

It appeared for me after I installed Gizmo - may be a coincidence but Windows had been slightly unstable since Keith

Installed along with Gizmo Project and now loads everytime I turn on the PC. Hash

come's packaged with kodak pinter dock/camera v6.0 sofware which bundles quicktime see spynet for more info See also: Linkbunny hopper

Mysteriously appeared after installing Kodak Easyshare upgrade to 6.0 jumpshotjrh

This is stupid. go into safe mode and delete the "Bonjour" folder (Programme Files) and MDNSRESPONDER.EXE (Windows\Prefetch) if you have it somehow. Today it so randomly ate up 100% of CPU power, i had to kill it in safe mode. Samurai that knows computers

after installing nero 7.5 i found this file. so it must be part of Nero's files. neugent

I think Adobe uses it also Ryo

I didn't ask for it to be installed - I don't want it, and the following link should remove it. See also: LinkAndrew

Anything that is installed as HIDDEN!..forget about it. Redeemer

Haven't updated ITunes and don't own an Apple so I wonder how this file came into use on my system all of a sudden? Never heard of Bonjour for Windows either so I find this strange... Lisa

Appeared after install of Photoshop CS3

99% of processor on AMD 64bit System now unstable as well sam

It is an apple process. On my comp the mdnsNSP.dll which comes with the bonjour service has been activated by roughly five processes simultaneously - AOL, Utorrent, Peer Guardian, spooler subsystem app chris

I think this appeared when I updated VoIP Cheap software... sirbyte

it installled without permission, i don't know if its a virus or not Stacy

I found the process and could pass windows firewall without my permission. I deleted it without explanations I don't know where has come from... antonio

Installed itself with Abobe Creative Suite CS3, I have never used iTunes on this machine Richard

Installs with VMware 6 Beta. Process Explorer shows VMWare Tray Tools using the application when running. mDNSResponder.exe installs as a System Service, and files are located at (X):\Program Files\Bonjour\ Where X is your System Drive Letter. Bonjour is an Open Source Networking Technology from Apple Inc. See also: LinkDoug

It appeared after installing Photoshop CS3 and causes the system to hang and crash HP

This is part of Apple Bonjour, however system slowed down, including sign-off times are about 10 times longer. I do not have iTunes and at this time do not know where it came from. john

Installed by Crapple without permission, used 99% CPU (AMD 64 3500+), stopping the service and deleting it fixed. James

installed when updated Kodak EasyShare software 316

I got mine with Adobe Photoshop CS3 BETA installed it. Removed it with KillBox (delete-on-reboot) and PS still worked. Vedran

Installed with Kodak Easyshare v6 Luxie

Installed as part of Suitcase 11? I don't have Gizmo, and there is no add/remove entry for Gizmo. Since installing, my sound playback has been 'skippy'. I suspect it's part of the Suitcase Server system. Stopped, then disabled it in services. John

I got it from the program MusicMagic Mixer by Predixis.. Uninstalling the program did the trick.. :P wfcamb

Part of Bonjour, but seems to be associated with a "Printer Wizard". Attempting removal... Brett

I got it after installing Dreamweaver and Photoshop CS3, Not quite sure what it is. Michael

have no apple products installed on my pc but this process has appeared from somewhere gazz

Appeared after I installed Adobe Photoshop Cs3 Beta Doggie

Part of "Bonjour" which is Apple's networking service. So it doesn't surprise me that iTunes uses it. But in my case, it was most definitely installed by Adobe CS3 installer. I think Adobe is using it to phone home. Andy

For me it was installed as part of Gizmo project and running from gizmo folder. Cos

this is part of adobe CS3 asset services

if you delete it, winsock is failed and your system cannot networking R0mE0

This is an Apple product that is bundled with Quicktime and iTunes Midshipman

It will make ur comp go lag, will slow down the page/loading while surfing the FireFox or IE, close some other program too. Get rid of it asap. Faye Valentine

This is also part of all Extensis Trials e.g.. Extensis Suitcase and also Adobe Photoshop CS3 trial.. Hans Torre

it was installed on my machine with adobe photoshop cs3 Ivan Brokowich

I first saw it apear after installing the Kodak Easyshare software. Not sure what it does... John a.k.a. Mobius 1

pile of crap software for iTunes. I don't know how it got on my system as I have no apple product and I do not have QuickTime. I'm unable to remove it as it says that I do not have permission too... Andrew

It called my IP twice during install. of an other AP. I don't like it severin

This is a harmless networking functionality component which is part of Apple's open source Bonjour (networking computers and smart devices) technology. Most printer manufacturers including Epson, HP, Brother use this technology to enable adding and/or removing printers from network without configuration changes. Ahead Nero 7 uses this to enable file sharing. Many other softwares use this technology for similar purposes. See also: LinkIrfan

after I found everything going very slowly I hit ctrl+shift+esc to see which process takes up all resources j2oe

It comes with a update for GameTalk, brings up CPU to 100% usage.. Jeroen Nijhuis

Sends out robotic parse files to the spacewalks server at Quams University. Apple uses it to conduct music surveys. not dangerous. dustin

Gets installed during Adobe CS3 setup without permission. See link for deletion. See also: Linkfago

it came on my pc with a virus. it used my routers forwarded port. i didn't like that so i deleted it igor from the netherlands

Installed with Adobe Photoshop CS3, disable the Service "##Id_String1.6844F930_1628_4223_B5CC_5BB94B879762##". See also: Linkcrj

When removed from regedit, this responder shuts down several network services, and makes the computer unable to acces the network. Not possible to reestablish once deleted. Tried to shut it down, but didnt work for me. mdnsresponder is malware!! Kenneth

Installed along with the Adobe CS3 beta without asking. Easily disabled as mentioned above. Walt

installed with photoshop cs3 beta martu

Well, I just installed my new Kodak camera + software, and there it was. The software is called easy share from Kodak. I think it is meant for picture sharing over the inter with Kodak because the program tried to connect with their servers while the default setting is set on share...now ay I am gonna share my personal pictures! jaramai (holland)

This service will also be installed if you have Photoshop CS3 or other Adobe CS3 line software (Illustrator,Indesign,etc.) so you don't have to panic but you can use the link to uninstall it and then delete the files under C:\Program Files\Bonjour as this is not a crucial service. See also: LinkNeo

Apple is getting like microsoft with worthless processes tying up our system Mike

Installed with Adobe Photoshop CS3 Extended Demo Dany

Found running from C:\Program Files\Bonjour at system startup. The properties indicate that it is Apple software, but I have never installed iTunes or Gizmo. See also: LinkBenchmark Reviews

It is BonJour for windows. I got it when I downloaded Safari for windows 3.0 beta See also: Linkaspdevstudio

is used by CS3 Version-Cue to automatically find and connect local Cue-Servers, but needs to connect to internet!? Link supports information to deinstall that thing. See also: LinkPG

Was installed after I installed Adobe Dreamweaver CS3. I do not have ANY Apple software on this Windows machine. Felix

Right you can remove this properly from the command prompt. Doing it the "proper way" removes the registry entries as well. The link is adobe's page telling you how to (simply) remove it! See also: LinkJames McGuire

It is installed also by Adobe products which use Adobe Version Cue CS3 See also: LinkValeri Georgiev

mDNSResponder.exe - Is a not so dangerous process, but may cause incompatibility with some programms on your PC Actualy this is a part of Bonjour, But it slows down the network. risky factor!! The - mDNSResponder.exe dangerous side is Little Hol through which others can connect, i`ll tested it with some "illegal software" (sorry about this) but this is the best way how to check net security, software notifications are flowing throught the mDNSResponder (so Firewall Do nothing :) ) In MAC computers it work ok, but not On PC - So Apple need to think about security little bit more. Thats all... cosmo

Installed with Gizmo & QuickTime. Can make system & network unstable Seagoon

From Apple Homepage: "mDNSResponder is a Bonjour system service that implements Multicast DNS Service Discovery for discovery of services on the local network, and Unicast DNS Service Discovery for discovery of services anywhere in the world. mDNSResponder is built into Mac OS X and can be downloaded as part of Bonjour for Windows. Applications like iTunes, iPhoto, iChat and Safari use mDNSResponder to implement zero-configuration network music sharing, photo sharing, chatting and file sharing, and discovery of remote user interfaces for hardware devices like printers and web cameras." See also: LinkDaniel

This is the Bonjour service daemon. It's needed for things like iTunes Music Sharing to autodiscover other computers with media to share, etc. It's open source and not dangerous. See also: LinkTom

It came in with Safari for WIndows on my system. It will tend to hang if network gets boggy Dukker

This file appeared after I did a install of Adobe Photoshop CS3. It tries to connect to several IPs during uptime.It does not eat up memory on my rig but it might do on yours. From what I have seen and read about this service. It tries to "phone home" to a certain company to tell them that this and that application has been installed on the computer. Ninjaaaaah 5k

Apple file installed with cs3 You can delete this service this way: http://kb.adobe.com/selfservice/viewContent.do?externalId=kb400982&sliceId=2 Serious Sam

Service was creating .tmp files that SAV Corp continuously reports as a trojan William Shatner

I found it AFTER installing Apple's Safari for Windows. Uninstall it and the process will be uninstalled. I think it's a harmless process but i preferred to have it removed anyway. Nickelgrey

it was apparently installed with Adobe Creative Suite 3 Design Premium. It was in the C:\Program Files\Bonjour directory.

It has been installed,when i had installed PhotoShopCS3 Yuri

It installs with Adobe Photoshop, and other Adobe's CS3 products. See also: LinkDeath bunny

Came with my photoshop Cs3 install! Broken

can be bundled in with MSN virus, causes u to send files to people spreading it jonathan

it seemed to apear after installing Macromedia Dreamweaver shino

this file was created after Adobe Photoshop CS3 Install, i think it's not dangerous creator

Used by Adobe Version Cue SC3 Client

after I managed to delete it in safe mode with command promting, my browser (firefox) have lost all the settings: themes, extensions. In conclusion I think that's not ok at all! And that in the presence or ZoneAlarm and Nod32. My recommandation: delete it as soos as you can!! adrian

Was installed on my system without my permission when i installed Adobe Photoshop CS3. It caused windows te become unstable (network problems (mostly dns related) and high CPU usage). Problems stopped after I removed the service. Chris

Installed by Adobe Photoshop CS3 (30 day trial) jjlash

Used to communicate with Apple Bonjour networks. Useless if you have no Macs on your network. Installed by default with Adobe CS3. Uses about 3.5MB RAM on my machine for no reason. gnosis

It was installed along with Adobe Photoshop CS3 on my PC and is part of the Adobe Updater. I killed it in Safe mode with its dll file mdnsNSP.dll. si

Well I read the entire post and the only App I have installed is the bonjour App Which I never manually installed so I am not sure where it came from but I do notice it causes conflicts with the uTorrent App I am running. It causes my download and upload rates to fluxuate uncontrolably ! Head1st

Seems to be installed with Adobe Version Cue CS3 Arnaud

Bonjour is Apple's open source implementation of zero-configuration networking software. It is used by Adobe Version Cue CS3 client applications to dynamically discover Version Cue Servers on the local network. You can remove it as stated in the link below: See also: LinkAlbaraha

found this strange exe running after i had installed some adobe cd3 products, i have no apple software on this computer andi

This is Bonjour for Windows. Zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. Apple program bundled with some software. Follow my LINK to learn more or download an uninstaller here:http://download.gizmoproject.com/jasmine/TurnOffBonjour.exe See also: LinkChristian

Installed with different apps, Adobe Macromedia, ITunes, Quicktime, Gizmo, etc, and is part of Apples's Bonjour for Windows. Bonjour, also known as zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. See also: LinkAzee

Showed Up After Installing Extensis "Font Manager"

installed with adobe flash cs3

It's used mainly in large corporation settings, pretty much useless for the home user. Adobe has their own KB article about it. See also: LinkTrevor

Came along with Adobe Dreamwaever CS3 ... no threat here. Dologany

This damn thing slowed my computer down to a hault out of no where. It was bundled in something and it wasnt iTunes, Quicktime, Skype (I think Extensis Portfolio did it!) Graphicsman2244

came from nowhere, i seen it in the process list and disabled it because of the name (bonjour service). Looks like junk to me. Tobé

You can delete it with tuneup shredder,but first you have to stop the process in your task manager! Zero

Slows down the system extreme, hard to delete w/o uninstall of carrying sw bär

PArt of the new Adobe CS3

i have instaled now adobe fireworks cs3... and this program is running and use internet speed... i think... if u install one of adobe CS3 series will install this to... i dont know what does but i will try to delete... use to much memory sometimes ;) ICEball

it insatalled with iTunes and wants to start even though itunes or any thing asociated with appl dosent start and alse disables some buttons like (Ctr-Space) for windows messenger plus James C

Appeared after I installed the Kodakgallery uploader plug-in for Firefox. I uninstalled the plug-in, but this file is still present. Mike

The current implementation of Bonjour for Windows is version 1.0.4. This version works with Windows 2000, 2003, XP, and Vista. It is primarily used in order to ease the installation, configuration, and use of network printers. Bonjour for Windows also adds Zeroconf capabilities to Internet Explorer, and provides a Zeroconf implementation to Java JVMs. See also: Linkwcryder

appeared when I updated iTunes, closing it seems to have no bad effect Tinkerer

mdnsresponder.exe is designed to feed Bonjour requests from any instance that is speaking this apple protocol. Some filesharing software or IM software use this protocol as well. Michael Schneider

If you check file info, it belongs to Apple -- but in your services panel, there's probably a suspecious entry (and running) with a big GUID id (looks like a series of numbers and letters). Bonjour is one of Apple's network protocol -- there are many ways Apple can install this, via iTune, Quicktime, and Safari. You can disable it in the services panel. See also: LinkAllen

Those like me that dont use any apple software (itunes nor quicktime) may get it from Adobe Cue installs. See also: Link

Installed with Adobe Photoshop CS3. After killing the mDNSResponder process and deleting "Bonjour" folder does not start anymore, and Photoshop continues to work with no problems. Teddy

provied an unstable network connection when used in a windows environment. Uses alot of sys resources and hit the firewall as quick as DoS attacks. Causes loss of connection and loss of ADSL signal especially with USB based modems. Apple has alot to answer for with this little "addon" samuraigecko

I got mine after installing the demo of DreamweaverCS3. I don't like it it EATS memory and CPU usage is abnormal.. K.Ongaku

Multicast DNS is an increasingly useful way for computers and peripherals on a subnet to find each other without having to rely on DNS. It is not essential, but certainly can make life easier. See also: Linktxoxy

simply, its an apple product that shares music and files. basically file and print sharing itunes style for windows. See also: LinkHugh

It has shown up after installing a trial version of Adobe Photoshop CS3, which did NOT offer the option of not installing 3rd party plugins. dj_indio

From Adobe:Removing Bonjour prevents Version Cue clients (Photoshop, Illustrator, InDesign, Flash, Bridge) from automatically discovering Version Cue Servers and Version Cue projects in your local network. You will need to connect manually using Connect to Server and the URL or IP address of the machine running Version Cue Server instead. See also: LinkPRD Sweden

99.9% certain it was installed with Adobe Photoshop CS3 Steve

It is an Apple computers Inc. software according to the registry entry: HKEY-LOCAL-MACHINE/SOFTWARE and other entries within the registry. This would suggest that it belongs to Quicktime music player. Andy (Turkey)

was installed by Kodak EasyShare v6.0 software to provide compatibility with a Kodak wireless camera. But, it appears to cause slow PC boot time. If you don't have a wireless camera, uninstall Bonjour from add-remove programs to eliminate it. If you need the service for some other reason, reinstall it from directly from the Apple site, which appears to work fine. Newer versions of Kodak EasyShare software no longer install Bonjour by default. cct76

Also used by Adobe. This file is a part of apple's open source zero-config network discover app See also: LinkRonan

Appeared when I installed CS3 Thank U

mdnsresponder.exe is a process associated with "Bonjour for Windows" software. Bonjour is Apple's open source implementation of zero-configuration networking software. See also: Linkcrux

I'ts the "bonjour" service from Apple that is used to connect devices through a network -usually for file sharing. It was installed on my computer after I installed Adobe CS3. In Adobe CS3, msDNSResponder.exe is used to connect to the Adobe Version Cue server that is on a LAN. Adobe Version Cue is a server application that is used to manage file versions. Raditya Arthapraja

Start-- Run type: sc delete "Bonjour Service" You'll see that the weird string service is disabled but still running. Right click the weird string service and click Stop (name starts with ID_String...) then close service manager. You'll see mdnsresponsder is gone from task manager and no longer runs on startup knightmare

Comes with Dreamweaver & Fireworks - potential Spyware Deltablue

Installed with some apps which uses apple quicktime Jaro

WinPatrol says used by the Bonjour Service from Apple Inv. DanB

This version installs with Adobe Creative Suite 3 and components (Photoshop CS3). Used for local network only. Check the first link below to compare the ID String to make certain it was installed by Adobe. Link includes removal instructions See also: Linkjrily

It looks, like it is installed with adobe acrobat update. Issues background request, which my firewall blocks successfully. Seems not to be needed for anything usefull, if you do not use apple muasic sharing. It will just consume bandwidth. Alen

It uses about 960MB of RAM! Maksymus007

should be classified as malware because it's useless and must be removed manually A

On a formatted PC, this process appeared right after installing Photoshop CS3 RP

it came whene i install adobe cs3 abody

mdnsresponder.exe is also installed by Adobe Photoshop CS3 extended. BrianW

It is a part of Winamp & Itunes or any other music playing & sharing application. I used to think it only belonged to Apple until I had to reformat my PC and hadn't loaded Quicktime on it yet but yet it was there! It was because I had loaded Winamp already. Albert Einstein

Comes with photoshop cs 3 blackp

it's part of photoshop cs3, turn off with this program See also: Linkarturunch

Extensis software should need no network access (at least the Extensis software I use). I will be deleting this file. Rated at 4 due to non-disclosure of networked component, and apparent lack of need. Extensis sucks

The correct and only way to remove it is: Open a Windows command prompt and type the following command: See also: LinkMiles Siegel

When you install any edition of the Adobe Creative Suite 3 family or a Creative Suite 3 component on Windows, Bonjour for Windows is installed as a service on the machine. Bonjour is Apple's open source implementation of zero-configuration networking software. It is used by Adobe Version Cue CS3 client applications to dynamically discover Version Cue Servers on the local network. See also: LinkJoe Paul

it came with itune after installing. magic

This file is considered safe and is not virus or spyware related. See also: LinkBiQ

part of the flatster software. remains often after uninstall Asathor

Windows errors related to mdnsresponder.exe? The process mdnsresponder.exe is a component of the Apple Service, which is identified with the Bonjour for Windows software application initially utilized by iTunes because of its music sharing functionality. The mdnsresponder.exe process is a native element of the Mac OS X operating system and is associated with the MDNSNSP.DLL, which was ported for the Microsoft Windows Operating System environment. The Bonjour Service supported by the file mdnsresponder.exe is also described as a zero configuration networking process that provides an automatic magikx55

I've not idea how it got into "c:/program files/bonjour" But it wouldn't let me delete it, so i've renamed it, in the hope that whatever uses it can't find it.

This process comes with iTunes and it allows functions such as iTunes Remote (iPod/iPhone) and AirTunes speakers to work over the network. Not necessary if iTunes is not used for network purposes. Adriel

This file belongs to a program called Bonjur. If you do a seach in windows it shows as C:\Program Files\Bonjour. I for one just delet it the program and it was gone. Ignacio Alvarez

It's a nuisance that uses my computer, downladed from a SKAT game, my firewall asks if I need it to start, my computer slowed down Nik Tee

Another junk file by Apple, who thinks that a competition with Microscrap *must* imply acting the same way or even worse (to "feel" better)... Oh about USB and "real plug and play" and blabla from another poster: BULLSHIT! I hate those big companies who are adding stuff without your consent, hidden, and unrelated to the main functionalities of whatever stuff you install, not even considering that it can slow down your system: they don't car as long as they are harrassing the mass to "feel" strong! Apple is going down the sewer on my part... Bubo Siomo

It is used to share music...Some softwares like Apple Itunes, Adobe CS3 XX, etc. install this without users explicit consent. You can disable the service on the windows service applet if you don't want the dynamic network search feature for shared libraries. Anirban Pal

This File is hard on your cpu, causing your cpu to over clock itself, this file did NOT Come with Itunes or Quicktime because i installed the newest version of Itunes and Quicktime and that file never showed up, i think it has something to do with Spyware,Malware, Blackware, or some sort of Virus. But i am happy to say that i got raid of that File for easy instruction on how to remove that file i left my Email on the Link for more Details. Daniel J Lauber

This file appeared after installing Netscape and Safari Explorers, although since many people mentionned this being linked to Apple in some way, I suspect it has been installed with Safari. So far no problems have been caused in terms of system instability or security, but disabling it has no effect on the system ( that I know of ) so I would opt for that option for the time being. Cruentos Solum

This file hijacked my DNS and prevented me from going to certain websites. Stopping the process restored access to these sites. Very dangerous to users that don't know better. J.R. Floriani

From the Txt file: Bonjour, also known as zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. Bonjour uses industry standard IP protocols to allow devices to automatically discover each other without the need to enter IP addresses or configure DNS servers. Bonjour is a networking protocol that sends and receives network packets on UDP port 5353. If you have a "personal firewall" enabled, you will need to ensure that UDP port 5353 is open for Bonjour to work correctly. Certain firewalls will only partially block Bonjour packets. NickR08

It came with Adobe Flash CS3, not a threat! aledTH

seem to be appeared after installaing CS3 Paco

Adobe Photoshop installs this for you automatically. I don't believe this is a virus. HOWEVER quite a few people claim this slows Firefox, IE and logging on (plus other activities) significantly. I personally went into services.msc and disables it. I recommend you do the same. Anonymous

If you are looking for this in services manager to disable I found it listed there under the cryptic name of '##Id_String2.6844F930_1628_4223_B5CC_5BB94B879762##' rclick/properties to confirm that it is indeed BonJour on your machine. Ben

Apple's iTunes installs about 8 different programs when you intstall it. They are AppleApplicationSupport.msi, AppleMobileDeviceSupport.msi, AppleSoftwareUpdate.msi, Bonjour.msi, iTunes.msi, MobileMe.msi, QuickTime.msi, and SetupAdmin.msi. I'm not 100% sure what all these different programs do; however, Bonjour.msi installs this mDNSResponder.exe crap. The easiest way to deal with it (if you installed iTunes) is to go to [PC:\Program Files] and shift-delete the Bonjour folder. On a side note, you can also shift-delete other iTunes related folders such as Apple Software Update and iPod. Alan

It is linked to my Kodak wireless printer. I don't believe that it is harmful unless it is replaced by a virus. The size of the file on my computer is 238,888 bytes Gerard

It will start creating multicast propagated traffic especially in larger enviroments - it will create havoc & drag you Internet speed to a halt!! Installed by Apple iTunes Here to help 1

my version is part of LaCie network assistent, so i can manage my NAS Keld Thomassen

don't know what it does but appeared after itunes/quicktime setup scott

Apple Bonjour (Redezvous) allows you to use a network without any configuration, widely used in MacOS and Apple products, but also has a Windows version and may be included in other software not produced by Apple such as Adobe Photoshop. See also: LinkRodrigo Maciel

seems to be a real pest. Hard to fix as well without downloading other features not required, Wish this was not required buy iTunes PaulM

mDNSResponder.exe is a spy program used by Apple to spy on its customers and send information to Apples massive database on the activities of its customers. It is malware. See also: LinkAaargh

It is for Apple iTunes, and other apps (not necessarily Apple.) G-Man

Too Slow for XP drags the system down! g

Like many Apple startup programs for Windows, this is a fairly useless program as Windows does all of the things it suggests to do, by itself. It is invasive, hard to remove, and takes up resources. It is also suspected as being spyware due to packets sent out. Mewi